How to edit a read-only /etc/fstab during single-mode on CentOS

If somehow like me, you edited the /etc/fstab wrongly and have to enter the maintenance mode to rescue it but was not able to edit it.

For this blog entry, I'm writing on using a Linux CD to do a rescue.

Step 1: Put in the CentOS 5.4 CD and boot to CD

Step 2: Press F5 and type linux rescue at the boot prompt

linux rescue

Step 3: When given the command prompt again after a series of screen

# vi /mnt/sysimage/etc/fstab

Do the necessary changes to /etc/fstab
Step 4: Do the reboot

# reboot